|Lift Name|Type|Top elevation (ft)|Bottom elevation|Vertical rise|Length (ft)|Slope (%)|Capacity (rides/hr)|Speed (ft/min)|Lift Manufacturer|Year installed|
|---|---|---|---|---|---|---|---|---|---|---|
|Bruno|fixed double|5,885|5,840|45|368|12%|630|300|Poma|1987|
|Molly's Express|detach quad|5,835|4,990|845|5,244|16%|1200|1000|Doppelmayr|2000|
|Pucci|fixed triple|5,920|5,350|570|3,398|17%|1,330|450|Poma|1987|
|Stormin' Norman|detach quad|6,245|5,460|785|4,396|18%|1500|1000|Doppelmayr|2000|
|Magic Mile Express|detach quad|6,990|5,915|1,075|5,359|20%|1600|950|Poma|1992|
|Palmer Express|detach quad|8,470|6,940|1,530|5,468|29%|1800|1000|Doppelmayr|1996|
|Jeff Flood Express (Still Creek Basin)|detach quad|6,020|4,850|1,170|6,506|18%|1800|1000|Doppelmayr|2007|

Question: how many lifts were installed after 1991?
Answer: 5